Recordings are from 1972 through 1975 on analog tape. Sound quality is phenomenal. There are no obvious limits imposed by the very high quality analog tape, microphone technique or recording hall, other than perhaps a touch of overload. (Piano is notoriously hard to record well due to wide dynamic range, sharp percussive attacks, a large physical volume, etc.) It would not be surprising if this digital transfer sounds better than the LPs it was originally released on. The piano is a bit close-miked, yet there is very good hall sound.